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MGC
Travesca®
Transformer bushings
Tiresca®
Busbar systems
Duresca®
Wall bushings
Duresca®
Busbar systems
Gaslink®
SF6 insulated busbar systems
Product range:
MGC’s know-how and expertise are based on the RIP insulation (resin impregnated paper), which was in-
vented by MGC. In this area we have a remarkable experience because we have been using this method
since 1958. This type of insulation offers numerous advantages: free choice of positioning, no partial
discharges with the voltages used. Therefore this insulation is especially indicated in the area of fully insu-
lated busbars for medium and high voltages and with high current. Hence MGC is the uncontested expert in
this field.
Our technology is also boosting in the bushing sector: wall bushings as well as transformer bushings. Based
on this experience MGC is a well-known and appreciated player.
Thanks to the size of our company we can offer a high reactivity, and our independence explains our large
clientele.
This booklet not only illustrates our know-how, but also the various applications and the different handlings
according to the technical environment.
We hope you will find a lot of interesting information in this brochure.
Oliver Härdi Richard Unterseh
CEO Sales Manager
Preface
3
4
one...
5
...team
1914 March 19, Moser-Glaser & Co. was formed, situated in the city of Basle.
Main business: development, production and marketing of small transformers, up to 4 kVA
1921 Birth year and first supply of new developed 8 and 15 kV power
transformers
1922 First delivery of dry type instrument transformers for indoor application for the Swiss railway
company, 15 kV & 66 kV
1939 May 2, a joint stock company was formed and renamed
Moser-Glaser & Co. Inc.
1944 Development of porcelain insulated voltage transformers
1946 December 20, factory moved from Basle to the new location in Muttenz
1947 Major break through in the field of insulation materials: first delivery of 20 kV epoxy cast resin insulated
instrument transformers, SILESCA®
, completely developed by MGC. Manufacturing of 500 & 1000 kV test
transformers and 380 kV oil isolated voltage transformers
1958 Birth year of the insulation material, DURESCA®
, based on the RIP (resin insulated paper) technology
1990 New SF6 insulated busbar system, GASLINK®
, was developed and produced in co-operation with Siemens
1996 Moser-Glaser developed a new partially insulated busbar system, TIRESCA®
2001 Take over by the company PFIFFNER Instrument Transformers Ltd., Hirschthal, Switzerland
2004 Birth year of the TRAVESCA®
Transformer-Bushing product line
2005 New company facility and production plant in Kaiseraugst,
Switzerland
2008 Extension of manufacturing plant in Kaiseraugst to total 3350m2 workshop floor space
MGC - a century of electro-technical tradition
6
Page
Product range 2
Preface 3
One Team 4, 5
One century tradition in the electro-technical tradition 6
Summary 7
Expertise of MGC Duresca® busbars 8, 9, 10
Duresca®
busbars and bushings under sever climatic conditions 11
Expertise in offshore applications 26
Applications of MGC Duresca® busbars
Hydroelectric power plant 12, 13
Oil refinery 14, 15
Gas and steam turbine power plant 16
Gas turbine power plant 17
Pumped storage hydro power station 18, 19
Renewable energy: Solar power station 20, 21
Renewable energy: Geothermal Power Station 22, 23
Link between gas turbine and generator 24, 25
Renewable energy: Offshore wind farm 27
Industry 28
High Voltage application 29
Replacement of GIS equipment 30, 31
123 kV H.V. Duresca®
busbar application in a test laboratory 32
A classic Tiresca® application: protection against damages caused by small animals 33
Transformer Bushing Oil to Air from 36 to 300kV 34, 35
MGC boosts its wall bushing product line 36, 37
Checklist for Duresca® busbars 38
Checklist for Travesca® bushing Transformer-Outdoor 39
Summary
7
Vacuum impregnated and dried creep paper with cycloaliphatic
resin (called RIP), has been used more than 50 years in the
DURESCA® busbars and bushings in applications all over the
world. MGC Moser-Glaser invented this technology in 1958 and
has the longest experience in the field with this material.
The successful RIP applications of busbars show that we have
also to compete with other possible designs. The main differ-
ence concerns the protection of the RIP body. The other possi-
ble ways consist in a heat shrinking hose instead of an effec-
tive protection tube as proposed by MGC. In case of outside
applications, the shrinking hose has additionally to be pro-
tected with a metal tube, which builds an air gap between the
surface of the busbar and the metallic enclosure. The air will
condensate and will degrade the insulation properties. This is
not the case of the Duresca® busbar system where the RIP
body is always protected by a tube.
Expertise of MGC Duresca®
busbars
- Type DE with a corrugated polyamide which represents the
major part of our deliveries
- Type DG with Cr-Ni steel which is used mainly for the higher
diameters and where the polyamide tube is no more
available.
- Both types are produced in the same way. There is absolutely
no air gap between the RIP body and the protection which is
filled at the end with pure resin.
- This tube has 3 main issues:
- the best possible barrier against humidity and moisture
ingress
- to be an excellent mechanical protection
- to offer with the Type DE , an additional creepage distance
Mechanical protection:
PA tube
RIP Isolation:
fine graded capacitive layers
Humidity barrier:
pure resin layer
Conductor with high
electrical conductivity:
Aluminium or Copper
creepage distance of about 16 mm/kV
arcing distance
capacitive controlled area
fully insulated
touch safe area
IP67
8
1 2
3
GuD Linz / Austria 25m long in vertical position
No additional protection is needed for outdoor application.
72,5 kV EPCOR / Canada (Photo 2)
Duresca® in a H.V. application and in outdoor installation.
110 kV UW Kolin / Czech Republic (Photo 3)
Duresca®, the only fully insulated busbar system which is available in
the H.V. level, till to 170 kV.
9
Type DE with a corrugated PA polyamide tube.
The chemical composition of this polyamide was specially de-
veloped for MGC more than 25 years ago. It is very important to
grant the best possible behaviour against weather in exposed
outdoor situation and this for a long time period. This is sup-
ported by a testing in 1993, in an independent laboratory, ac-
cording to ASTM D2565 standard, for more than 5000 hours,
with excellent results.
This protection tube offers highly UV stability.
The material is also self-extinguishing, free of halogen and
phosphor and was tested according to IEC 60332-3 and DIN
50266-2.
Relevant are the chemical properties:
- resistance to salt water
- resistance to mineral oil, fat, fuels, weak acids and bases,
termites
- none sensitivity to fungus and mould or mildew
Earth layer
Also particular for the DURESCA® busbar system is certainly
the earth screen in copper, embedded in the insulation and
designed for fault current of 8 kA/1s in case of an exceptional
insulation failure.
Particularly adapted in very corrosive atmosphere like in offshore
applications
KW Löbbia / Switzerland
Preparation of the earth layer in production
Conclusion
The DURESCA® busbar system, with the highest level of
quality allows a safe lifetime of more than 30 years. It is a
compact design with reduced bending radius, designed for
easy and fast installation, without maintenance.
10
Temperature changes and their impact on busbar perform-
ances
MGC carried out climatic tests in order to prove the excellent
behaviour of its busbars in extreme climatic conditions. One
test was performed by Hydro Quebec, Canada in the Labora-
toire mécanique et thermomécanique on 2 insulated Duresca®
busbars samples 17,5 kV and 2650 A.
Each of these 2 models consists of a set of 2 busbars, each
with a silicone insulator at the extremity and connected by a
sleeve.
These tests involved thermal cycling between +40°C and -50°
C with a period of stabilization at each of these 2 tempera-
tures.
At the end of each temperature stabilization period a current of
2650 A was circulated for a period of 2 hours. At the beginning
of each temperature decrease the test objects were exposed to
a spray of tap water.
During the tests 5 thermal cycles were carried out. These tests
consisted of measurement of the dielectric withstand, capacity,
dielectric dissipation factor (tan δ) and partial discharge inten-
sity. Check of the bolt tightness (torque) of the flexible joint
after completion of all other test. The busbars passed all of the
tests successfully.
Duresca®
busbars and bushings under severe climatic conditions
- 60°C + 50°C
Low Temperature Test at -60°C :
Wall bushing 72.5kV—1600A outdoor - outdoor
Transformer bushing 145kV—1250A
Busbar 24kV—1250A
This test was performed by the Institute of Electric Energy Sys-
tems and HV Technology – University of Karlsruhe (Germany).
The equipments were placed in the climate chamber. Starting
from ambient temperature (20°C), the temperature was low-
ered to –60°C for 68 h. This time is long enough to get thermal
equilibrium in all parts of the test objects. The dielectric meas-
urements were performed before and after the climatic tests.
The equipments passed all tests successfully.
11
ABB AS, Power Technologies Division, Norway placed an order
for two three-phase links between generator and power trans-
former for the power station in Hunderfossen. It is located in
the middle of the tourist areas Hunderfossen and Hafjell, north
of the town of Lillehammer. Hunderfossen power station is one
of the most famous power stations in Norway. The power sta-
tion is characterized by a dam of 280 m long above the
Gudbrandsdalslagen river.
The 16 m high dam has ten spill gates with a flood diversion
capacity of 3000 m3/s. The power station has an absorption
capacity of 320 m3/s.
Duresca®
busbars in Hydroelectric power plant
The power station is set up inside the mountain, west of the
river. The water is discharged into the river about 2 km down-
stream. The power station has 2 Kaplan turbines with a total
effect of 116 MW. In the period 2000-2002, both blade wheels
were changed with the result of a notable increase in produc-
tion.
12
The scope of supply of MGC consists in the delivery of these 2
links between Generator 1 to Transformer 1 and Generator 2 to
Transformer 2. Both are located inside the building.
The main electrical data are:
- rated voltage : 12 kV
- rated current : 4000 A
- short time capability: 31,5 kA / 3 s
The total length of these 2 systems represents 315 m busbars,
36 bends and 30 connecting sleeves.
Old Installation After renovation
The fully insulated Duresca® busbars will replace an existing
air insulated blank system. One of the reason is the increase of
power and certainly also with the advantages of a fully insu-
lated system.
As usual MGC will deliver the complete fixation and earthing
hardware and all accessories like flanges and wall plates.
13
Naftna Industrija Srbije's (NIS) Pancevo refinery is situated in
South Vojvodina, Serbia. The refinery, which began operations
in December 1968 produces petrol, diesel, jet fuel and fuel oil.
Gazprom Neft hold 51% interest in NIS. Following the
acquisition, Gazprom has planned to invest € 500m in
upgrading NIS' processing facilities.
Siemens received a contract as part of Oil Industry of Serbia’s
strategy for modernizing the Pančevo oil refinery.
That included:
- modernization of the jetty facility for loading/unloading the
barges carrying petroleum products
- truck loading/unloading facility modernization
mild hydrocracking complex and hydrofinishing (MHC/DHT)
project
- 220/6kV high-voltage (HV) substation project including the
busbars delivery.
Duresca®
busbars in Oil refinery
A refinery is also characterized by an aggressive environment.
The design proposed by MGC is particularly well adapted to
such applications:
- DE type with its corrugated polyamide protection tube which
offers highly UV stability and weather effect resistance.
This material is also self-extinguishing, with excellent
chemical properties, resistance to mineral oil, fat, fuels,
weak acids and bases.
- DG type with its Cr-Ni steel or aluminium, both painted which
given their characteristics, propose an excellent behaviour.
14
Transformer connection
Busbars through the wall Busbars through the wall
Fully Insulated Connecting Sleeves
DG Type 12kV / 4000A and DE type 12kV / 3150A
MGC delivered DG and DE types of busbars for this refinery
both can be installed in indoor as well as outdoor location.
- DG type, 12kV and 4000A, and about 300m
- DE type, 12kV and 3150A and about 250m
The installed links consist in a connection between two
transformers and the related switchgear
DG
DE
15
On behalf of KAM (Kraftanlagen München), Elpro GmbH Berlin
placed an order with MGC for producing and fitting busbars for
the power plant GuD-Linz in Austria.
Scope of supply:
- 1 link from the steam turbine to the power transformer:
12 kV - 3750 A and a total length of 380 m busbars
- 1 link from the steam turbine to the switchgear:
12 kV - 3750 A and a total length of 80 m busbars
- 1 link from the gas turbine to the power transformer:
12 kV - 4500 A and a total length of 310 m busbars
- 1 T-off link to the auxiliary power transformer:
12 kV - 630 A and a total length of 15 m busbars
The fitting took three months in total. The altitude in which the
assembling took place was remarkable: the fitters had to be
free from vertigo since they had to work in 25 m altitude! More-
over our on-site collaborators were in charge of material supply
and also logistics.
The project’s success was mainly based on the smooth coop-
eration of our various departments, such as design, production
and assembling team.
Duresca®
busbars in gas and steam turbine power plant
Duresca® busbars in use at the power plant Gud Linz
MGC disposes of the necessary capacity, experience and exper-
tise to carry out successfully such large projects.
16
PPC Bratislava / Slovakia, in line with an upgrading of a gas
turbine power plant, are using a Duresca® fully insulated bus-
bar system for the connection between generator and switch-
gear, and switchgear to the power transformer.
A large part of this run is located in an outside situation. There-
fore and thanks to its standard protection tube which covers
also the exposed outside application, the choice of Duresca®
busbars is particularly appropriate.
The nominal generator power of 68.24 MVA leads to a design
current of 4000 A under a voltage rating of 17.5 kV. The corre-
sponding short circuit capability is 63 kA during 1 s.
The scope of supply incorporates
- 63 individual busbars for a total length of 485 m
- about 100 bends
- 57 sleeves
- and what is a tradition by MGC, all the necessary hardware
for the fixation, earthing and relevant accessories
MGC disposes of the necessary expertise to handle success-
fully such large projects.
Duresca®
busbars in gas turbine power plant
17
The increased demand for renewable electricity leads utilities
to exploit more and more the existing hydraulic resources.
Some countries like Switzerland are, with all the beautiful
mountains, favoured. A good example concerns EWZ
(Elektrizität Werke Zurich) who decided to renew an important
pumped storage plant, KW Löbbia.
To ensure a better reliability of the electricity production a
second power transformer 220kV was installed and as conse-
quence the electrical substation was completely redesigned.
This ensures the redundancy of the power station.
MGC was awarded with the complete busbar supply, between
3 generators, switchgears main transformers and auxiliary
transformers.
Duresca® busbars in a pumped storage hydro power station
The main electrical data are:
Rated voltage: 17.5kV
Rated current:
between Generator to Switchgear: 2650A
between Switchgear and Transformer: 2900/4100A
between Switchgear and current limiting Reactors: 1050A
between Switchgear and Pump: 1750A
Short time capability: 50kA / 3s
Installation altitude: 1500m
Design temperature: -40….+40°C
The complete scope of supply represents 1350m busbars. As
common practice, all the fixations and earthing hardware are
included Also part of this supply, 33 VT’s and 48 CT’s manu-
factured by Pfiffner.
Current
limiting
reactors
Busbar 1 Busbar 2
Gen/Mot Gen/Gen-M
220kV AIS Switchgear
Current
limiting
reactors
Oustide view of Löbbia substation
18
Connection to the current limiting reactors
Current Transformer Voltage Transformer
1350m of busbars have been installed
Connection to the switchgears
19
The Solar Millennium, one of the largest solar thermal power
plants in the world, has begun the development on the 50 MW
Andasol 3 plant in southern Spain for completion in 2011. Situ-
ated on the Plateau of Guadix in the province of Granada, An-
dasol 3 is the third of the Andasol projects using parabolic
trough technology and also the first in Europe. The Name of
Andasol is a combination of Andalusia and Sol (sun in Spanish).
Andasol 1 is grid connected, having been officially inaugurated,
while Andasol 2 is in the test phase. Each of the 3 plants will
feature a collector surface of 51 hectares and will reach an
output of approximately 170 GWh per annum. Each plant has a
gross electricity output of 50 megawatts. Because of the high
altitude (1100 m) and the semi –arid climate, the site has ex-
ceptionally high annual direct insulation.
Duresca®
busbars in renewable energy: Solar power station
Andasol has a thermal storage system which absorbs part of
the heat produced in the solar field during the day. Each heat
reservoir consists of 2 tanks measuring 14 m in height and 36
m in diameter and containing molten salt. This allows the plant
to generate electricity for almost twice the amount of hours as
a solar plant without the storage system.
UTE Andasol placed an order with MGC for the Duresca® fully
insulated busbars and the corresponding fitting. MGC has the
experience and expertise to carry out successfully such impor-
tant projects.
20
The use of the Duresca® in this solar power plant corresponds
to a typical application of fully insulated busbars system:
- to connect the generator to a power transformer and that via
a switchgear
- to feed the auxiliary transformer from the switchgear
Also the electrical data justify the use of Duresca® busbars:
- main link from generator to the power transformer: 17,5 kV,
a rated current of 3500 A and a short circuit capability of
63 kA 1 sec.
- link to the auxiliary transformer: 17,5 kV, a rated current of
800 A and the same short circuit capability of 63 kA 1 sec.
The scope of this order incorporates:
- approx. 300 m busbars system length for the main link of
3500 A rating
- 100 m for the connection of the auxiliary transformer
- as usual all the fixation hardware, fire wall plates, earthing
cables
- and the complete assembling
A distinctive advantage of the Duresca® busbar system is cer-
tainly the fact that no additional protection is needed in case of
an outdoor installation and for this project the major part of the
busbars are installed outside.
1) 2) 3) 4)
1) Generator connection
2) Auxiliary transformer
3) Circuit breaker
4) Power transformer
21
Duresca®
busbars in renewable energy: Geothermal Power Station
Recent supply of MGC, the Geothermal Hellisheidi Power
Station started its operation in 2006 and is actually the sec-
ond largest geothermal power plant in the world, 213 MW in
electrical energy, biggest in Iceland. This plant is situated in
the city of Hengill, an active volcanic ridge in Iceland, South
West of the country.
Orkuveita Reykjavíkur is its owner. Once completed the full
capacity of this plant, the Geothermal Hellisheidi Power Sta-
tion will be the largest of the world with 300 MW in electricity
and 400 MW in thermal energy.
The installed capacity includes 4 turbines with 45 MW and 1
turbine with 30 MW, all in operation. This plant started its
operation with just 1 turbine with 40 MW and 1 with 45 MW;
in 2007 received 1 more turbine with 30 MW and, in 2008
added 1 turbine with 40 MW and 1 with 45 MW. In 2010 this
disposition was reviewed to get the current capacity.
This plant is combined with heat and power plant. The pur-
pose is to meet the increasing demand for electricity and hot
water for space heating in the industrial and domestic sec-
tors.
The region covers 112 square kilometres and is one of the
most extensive geothermal areas in Iceland.
The Orkuveita Reykjavíkur supply heating, water and electric-
ity for more than 50% of Iceland population, and due to this
reason needs a safe partner to supply them quality equip-
ment. MGC is the best partner for these applications, be-
cause we have top quality products, a specialized technical
team to give support on design and after sales services, and
may deliver its systems in a short time.
22
Electrical data and Duresca® Busbar use:
- main circuit connecting power transformer—generator—
switchgear: 17.5 kV, rated current 3150 A, short-circuit
capacity 40 kA 1 sec.
- auxiliary circuit: 17.5 kV, rated current 1250 A and the same
short-circuit capability 40 kA 1 sec.
The scope of this supply:
- 270 m of DURESCA Busbar in 17,5 kV 3150 A
- 90 m of DURESCA Busbar in 17,5 kV 1250 A
- as usual, complete set of supports, earthing systems and
bends
- assembly supervision service
1) 2) 3) 4)
1) Power transformer connection
2) Auxiliary transformer
3) Switchgear
4) Generator
23
ABB Energi & Industri A/S, Denmark, placed an order for two
threephase generator links for the Power Plant Mongstad CHP
of the DONG Generation Norge AS, Norway. Each of them con-
nects a gas turbine generator with a power transformer. In
addition to that the power supply of the excitation transformer
is connected by a T-off sleeve.
Duresca®
busbars for a link between gas turbine and generator
Technical data of the busbars
- 24 kV and a max. current of 7000 A for the main busbar
- 24 kV and 1000 A for the derivation to the excitation
24
A part of the installation is an outdoor service (transformer).
The delivery also comprised a metal framework of 7 m. MGC
delivered the required protection boxes for the generator side
as well as for the transformer side and a fire wall plate was
also supplied.
This is where the fully insulated Duresca® busbars offer an
ideal solution for a high voltage application for indoor and out-
door service.
Transformer Side
Advantages of this solution
- Little space is required
- Smallest possible arc radius
- High short-circuit strength
- Fully insulated busbar system
- Natural cooling
Generator Side
T-Off sleeve Main busbar 24kV /7000A
Secondary busbar 24kV / 1000A
Connection to the auxiliary transformer
25
The application of Duresca® busbars makes sense on off-
shore platforms, because they meet the requirements of a
rough environment and limited space. Furthermore they allow
to decrease the cost of platforms and to facilitate the assem-
bling.
Structural saving
The reduced bend radius allows, in comparison to cables, an
optimization of the run. This reduced space requirement leads
to a possible reduction of the structure dimensions and as a
consequence to substantial economy.
Expertise in offshore applications:
Why the fully insulated Duresca®
busbars are particularly indicated
Installation process
The use of connecting sleeves authorizes an optimized split in
the run and therefore simplifies, in comparison with cables, the
assembling of the busbars run. A simplified assembling saves
money and time.
Corrosion aspects from saline offshore environment
The severe conditions bound with the saline environment need
an adapted solution regarding the choice of the exposed mate-
rials. Fixation hardware is in a particular quality of stainless
steel, special fastening clamps are not in aluminium as usual
and what is to be noted, is the excellent behaviour of the pro-
tection tube in polyamide which represents also a strong bar-
rier against moisture ingress as well as a mechanical protec-
tion of the busbars. These are decisive pre-conditions regarding
corrosion given in the harsh sea environment.
Duresca® and Tiresca® busbars for Marine application
Jewel of Sea is equipped with Duresca® busbars
The Duresca® and Tiresca® of MGC have
been successfully certified by the Marine
division from Bureau Veritas and find appli-
cation in ships.
Marine Division
26
Siemens Power Transmission UK placed 3 orders with MGC for
a delivery of Duresca® Busbars and for the corresponding su-
pervision during the assembly work.
Offshore wind farm Greater Gabbard, which is one of the
world’s largest offshore wind farm projects. The delivery con-
tained 9 typical three phase MV sets, connections between
switchgears and transformers. The order consisted of 36 kV,
2000 A and a total length of 710 m busbars.
Offshore wind farm Thanet with the same application, connec-
tions between switchgears and transformers. The delivery con-
sisted of 36 kV, 2000 A and a total length of 206 m busbars.
Offshore wind farm Gwynt y More, this project consisted of
36kV, 3150A and a total length of 260m
Duresca®
busbars in renewable energy: Offshore Wind Farm
MGC is also in the position to provide adapted solutions in the
particular sea environment. Fixation hardware in stainless steel
- special fastening clamps not in aluminium as usual - and an
excellent behaviour of the polyamide protection tube are deci-
sive pre-conditions regarding corrosion given the harsh sea
environment.
Offshore wind farm Greater Gabbard
27
LG Display, a worldwide reputed manufacturer of flat TV moni-
tors, is producing the panels in South Korea. Up to now the MV
Energy supply from the main power transformer to the switch-
gear was realized with air insulated busduct systems. To up-
grade and ensure the power supply for the production line of
the panels they took the decision to use a fully insulated Dure-
sca® busbar system:
- Duresca® can be installed outdoor as well as indoor
- Thanks to the protection tube there is no risk of humidity and
moisture ingress, which guarantees a long lifespan of the
system
- No condensation, no heater is needed
- Maintenance free
- Natural cooling
- Single solid insulated phases
- Phase crossings are possible
- Plug in solutions for switchgear connections
- Vibration resistant
Duresca® busbar in the industry
This order consists in the delivery of:
- one three phase set of 24 kV and 3150A busbars.
The system length consists of 325 meters
- the delivery was effective in February 2010
MGC disposes of the necessary capacity, experience and ex-
pertise to carry out successfully such projects. And this pro-
ject’s success has led to a new order from LG Display for a new
extension on the same substation.
Phases crossing
28
EPCOR Transmission Inc., our end customer has selected MGC
Duresca® busbars for the renewal and expansion of the
Victoria terminal substation.
This substation is used for energy supply of Edmonton,
Alberta. The entire project represent CAN $ 54 million.
MGC Duresca® busbars are intended for coupling the two
separation systems.
MGC has provided 285 m, 72.5kV and 3150A Duresca®
busbars.
The use of these rails will be used under severe climatic
conditions, from -50 ° C to + 40 ° C.
High Voltage application for Duresca®
busbars in Canada
29
The PEPCO (Potomac Electric Power Co.), an utility company in
USA, reviewed its old substation located at downtown Washing-
ton’s Chinatown last year. This substation was 40 years in
operation and this period is the common life time of a normal
substation equipment. The main equipment, a regulating trans-
former, a special kind of transformer, is responsible to regu-
lates the flow of electricity in the District of Columbia and parts
of Montgomery County, Md. The replacement transformer
needed two years to be delivered at the site. This new equip-
ment makes the same job as the old one, but the new one has
several devices to make the supervision in the transformer
operation.
To follow these technological improvements and to keep this sub-
station full time in operation without fails, PEPCO installed DURE-
SCA® bus bars in this substation.
DURESCA® is the perfect solution for saving space, connecting GIS
equipment, keeping the complete system in operation with free
maintenance and getting a long life time. DURESCA® may be in-
stalled in outdoor or indoor areas without additional protection,
because itself is already protected by a polyamide tube which
prevents the action of UV rays, humidity and pollution.
This specific installation is for 145 kV fully insulated and touch
safe. The insulation for this high voltage level is guaranteed by the
RIP (Resin Impregnated Paper) technology applied at DURESCA®
bus bars. The DURESCA® bus bar system is a compact design and
guarantees a safe area for the employees of the substation.
DURESCA® bus bars are factory tested individually to ensure the
perfect operation of the complete system. There are many details
in DURESCA® bus bars to guarantee just one thing: keep your
system in operation.
Replacement of GIS equipment by Duresca® Busbar
145 kV and 1250 A
Ecological and Maintenance Free!
This old solution presented a lot of problems in the PEPCO substa-
tion, including leakage of the insulating gas. A quick view at the
pictures above may show potential leakage points in the installa-
tion.
To ensure the reliability of the reviewed substation, now with the
new regulating transformer, PEPCO decided to install the DURE-
SCA® bus bars instead of gas insulated system. This system is
composed of “eco” dielectric materials, such as compressed pa-
pers and naturally occurring resins, which are viewed as more
environmentally friendly. The combination of increase reliability,
resources maximization and reduced environmental impact is good
news for long-term goals of constantly improving reliability. In this
way, DURESCA® solution is beyond as alternative bus bar system
in the market because it may keep the advantages of GIS solution
as compact dimensions and correct regular problems of GIS bus
bars as leakage and high cost for maintenance.
Substation with existing old GIS equipment:
30
Scope of MGC Moser-Glaser equipments (1st step of Project):
- 168 meters of bus bars
- 16 pieces of sleeves
- 12 pieces of flexible connectors
- Support material
- Earthing material of the system
- Complete set of accessories to assembly the system
- Installation works
- All documents and drawings for assembly
Connection to the regulating transformer
Incoming line cable termination
Outgoing line disconnector termination
31
Duresca® is the only fully insulated busbar system which is
available in the H.V. level, up to 170 kV.
A typical high voltage application
- The supply of a test laboratory for power transformers
Siemens and KONCAR produce in Zagreb, in Joint Venture,
power transformers above 100 MVA and for voltages up to 420
kV. A new test facility is now in service. The infeed of the energy
was realized with Duresca® busbars. Thanks to reduced bend-
ing radius, the choice of fully insulated busbars was particularly
indicated given the limited space and the compact configura-
tion of the installation.
The connection is a typical outside/inside application. With the
exception of the protection of the external arcing distance with
silicone insulators, no particular precautions have to be taken
with Duresca® busbars.
123 kV H.V. Duresca®
busbar in a test laboratory
The electrical data of this link are a max. voltage level of 123
kV, a rated current of 2000 A and a short circuit capability of
40 kA / 4s.
The scope of this order incorporates
- approx. 260 m busbars
- 36 bends
- 33 sleeves
- and as common practice all the fixation and earthing hard-
ware and usual accessories
Such an application demonstrates the know-how and expertise
of MGC in the field of high voltage with fully insulated busbar
system.
32
In April MGC was informed that a marten had caused severe
damage in KW Neurath - RWE (a power plant in Germany).
This damage provoked a short circuit on the MV busbars be-
hind the power transformer between the phases, and led to an
electrical arc and a fire. The whole system failed. This incident
shows that a steel grid is not always sufficient to provide pro-
tection against small animals.
A classic Tiresca®
application:
protection against damages caused by small animals
This is where Tiresca offers an ideal solution and makes a pro-
tection against small animals needless. The cable connection
taps as well as the fitting of the current transformer are easy to
carry out.
EDF (Electricité de France) has been successfully using Tiresca-
systems for many years now. RWE (Germany) do also belong to
our customers.
Tiresca contains the same protection tube as fully insulated
Duresca busbars and can be used as well as for indoor as for
outdoor services. The problem of animals and branches penetrating in substa-
tions is globally known. That is where MGC provides the right
solution with its Tiresca program.
33
A better connections maker, Moser Glaser
Company researched a way to increase the
dielectric characteristics of the High Voltage
equipments.
As a result we MGC invented in 1958 the Resin
Impregnated Paper technology .
With more than 50 years of experience in
development of the RIP technology, MGC offers
transformer bushings Travesca® from 36 to
300kV
Take the best combination such as RIP with
silicone insulator
− A dry type insulation suitable to be
installed in position 0 to 90° from the
vertical and no specific requirement during
transport.
− Maintenance free; No oil inside subject to
leakage, or to be regularly checked.
− A higher thermal stability up to 120°C
which increases the reliability during
overload periods.
− The silicone insulator thanks to its
hydrophobic characteristic has excellent
behaviour against pollution and is
particularly suitable for salty or cement
environment.
− Weight reduced as well as flexible sheds,
increase its tolerance to vandalism, or
earthquakes. No risk of porcelain break
during shipping or handling; No collateral
damage.
Specific to the MGC exclusive design:
− Excellent mechanical properties, our
complete range comply with the class
Heavy Load (level II) according to the
IEC 60137-2008.
− Additional moisture barrier, MGC per-
forms special long duration tests to
prove the excellent behaviour under wet
condition of its bushings.
Travesca® have in standard a creepage
distance of 31 mm/kV SCD or 53.7mm/kV
USCD which corresponds to the very heavy level
and withstand for ambient temperatures be-
tween -40 to +40°C.
MGC is your independent bushing supplier.
TRAVESCA® Resin Impregnated Paper
Transformer Bushing Oil to Air from 36 to 300kV
34
Key references
ABB Oy Vaasa, Finland
Starkstromgerätebau,
Regensburg, Germany
Eskom, Contipower,
South Africa
EnBW AG , Siemens Dresden,
Germany
RWE AG, Alstom Grid
Mönchengladbach, Germany
Travesca® transformer bushings cover your needs for Um
from 36 to 300kV
The supply chain is simplified as the direct moulding opera-
tion is done in-house no need to supply an external compo-
nent, Moser Glaser can offer short lead-times for its standard
range of product.
In addition to our standard range, our design combined with
our production process allow a wide flexibility and adaptability
in order to provide tailor-made solution.
Our factory comply with:
SN ISO 9001 : 2008
SN ISO 14001 : 2004
BS OHSAS 18001 : 2007
35
During the last two years MGC has been boosting its wall bush-
ings product line.
This development was definitely favoured by the standardiza-
tion of this product. As you have certainly noticed offers and
drawings are made much quicker now. Our Duresca® Wall
bushings catalogue shows the complete product range of 24 to
245 kV bushings.
MGC is also in the position to offer short delivery times since
the whole manufacturing process is under total control includ-
ing the production of silicone insulators.
MGC boosts its Duresca® wall bushing product line
Silicone insulator injection press
In order to cover all needs MGC provide one creepage
distance, 31mm/kV SCD or 53.7mm/kV USCD which corre-
sponds to the very heavy level.
Outdoor—Outdoor application
Indoor—Inddor application
36
DM2K Ur: 72.5kV Ir: 1250A,
Special bushings for rotating Disconnector
Indoor - Outdoor bushing with PFIFFNER current transformer
A large number of the bushings have also a current trans-
former.
The fact that MGC is part of Pfiffner Holding makes all this far
easier. Our customers do not have to buy the transformers
somewhere else, since MGC offers the whole device with an
adapted flange.
Wall bushing equipped with a current transformer
• Several ratios possible
• Easily accessible secondary terminals
• Compact size
• Up to 4 cores
• Suitable for very high short-time current
Tailor made solution with a special flange for a full interchangeable
solution
37
Electrical data
Standard: IEC
Rated voltage _____ kV
Rated frequency _____ Hz
Rated current _____ A
Thermal short time current / Duration _____ / _____ kA / s
Dynamic short time current _____ kA
Design: Busbar type
The electrical data and environmental conditions are determinant for
the busbar design. Conductor with high electrical conductivity could be
in aluminium or copper. According to IEC rules the surface temperature
of the busbar cannot exceed 70°C and is based on a max ambient
temperature of 40°C. Therefore if the design ambient temperature
exceeds 40°C, it is important to note it. The rated voltage, according to
the IEC voltage coordination, leads to the dimension of the insulation
thickness.
Site installation
Outdoor / Indoor / Outdoor & Indoor ___________
The Duresca® busbars, thanks to its protection tube, which represents
the best possible barrier against humidity and moisture ingress as well
as mechanical protection, can be installed outside or inside without
problems, only in case of AIS connection, the arcing distance has to be
protected by silicone insulators or an adequate termination box.
Connections
Transformer
Location of the transformer ___________
Generator
Location of the generator ___________
Switchgear
Manufacturer ___________
Type AIS ___________
SF6 ___________
Oil ___________
Layout
Total system length (Single phase x 3) _____ m
Total bends per system (Three phase) _____
Optional
Protection box Transformer ___________
Generator ___________
Switchgear ___________
Wallplate (quantity) ___________
Fire wallplate (quantity) ___________
Fire wallplate (class) ___________
Checklist for Duresca®
busbars
Transformer & box
Environmental Conditions
Max. ambient temperature _____ °C
Min. ambient temperature _____ °C
Altitude if higher than 1000 m _____ m
1) Humidity barrier: pure resin layer
2) Mechanical protection: PA tube
3) Conductor with high electrical conductivity:
Aluminium or Copper
4) RIP Isolation: fine graded capacitive layers
1)
3)
2)
4)
Special requirements:
____________________________________________________________
38
Electrical data
Standard: � � � FSK Other _______
Rated voltage _______ kV
Bushing Insulation Level
Lightning impulse withstand voltage 1.2/50µs (BIL) _______ kV
Dry power frequency voltage withstand (AC) _______ kV
Switching Impulse (SIL) _______ kV
Rated frequency _______ Hz
Rated current _______ A
Connections
Altitude < 1000m Other __________ m
Ambient temperature -40 / +40 °C Other__________ °C
Oil temperature 90°C Other__________ °C
Creepage distance 31 mm/kV SCD or 53.7 mm/kV USCD
Cantilever test load Acc to the IEC 60137 class II
Seismic conditions
Angle of mounting 0-90° Other__________ °
Horizontal acceleration __________ m/s2
Vertical acceleration __________ m/s2
Design
Top terminal material ����������
����
� ����������������
�Tin Plated Copper
CT extension E � ���
������
�500mm
�_____ mm
Arcing horns �Yes �No
Oil side shield �Yes �No
Checklist for Travesca®
bushing Transformer-Outdoor
Power Transformer equipped with MGC Bushings
1) Top Terminal
2) Silicone Insulator
3) Condenser
4) Air Escape Screw
5) Test Tap
6) Mounting Flange
7) RIP, Insulating Body
1)
6)
2)
3)
Commercial
Company name:___________________________________________
Contact: _________________________________________________
Phone number:___________________________________________
email:___________________________________________________
Quantity: ___________ pieces
Delivery Term :
�EXW �FOB �DDU �Other________ Destination: ________
5) 4)
7)
39
MGC Moser-Glaser AG
Lerchenweg 21
CH-4303 Kaiseraugst
Schweiz / Suisse / Switzerland
Telefon +41 61 4676111
Telefax +41 61 4676110
Internet www.mgc.ch
E-Mail [email protected]
Alterations reserved
E 11.2012